Ruthenium-Catalyzed Addition of Carboxylic Acids to Propargylic Alcohols: An Easy Route to<i>O</i>-Dienyl Esters and Their Tandem Atom-Transfer Radical Polymerization
作者:Rajesh K. Jena、Uttam K. Das、Arijit Ghorai、Manish Bhattacharjee
DOI:10.1002/ejoc.201601091
日期:2016.12
A ruthenium-catalyzedone-pot synthesis of O-dienyl esters through the regio- and stereoselective addition of carboxylic acids to propargylic alcohols, and the atom-transfer radical polymerisation of the products have been developed. The initial addition reaction takes place through the formation of a carbon–oxygen bond followed by dehydration.
The stereoselective synthesis of dienyl esters with high atom- and step-economy has been largely unexplored. Herein, we report an efficient approach for the synthesis of E-dienyl esters via rhodium catalysis using carboxylic acid and acetylene as C2 synthon through the cascade of cyclometalation and C–O coupling. This protocol features mild conditions, excellent functional group tolerance, and exclusive